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50-ft 8 / 3 / Romex SIMpull Stranded Indoor CU NM-B W/G Individual pack ( By-the-roll )

Southwire 50-ft 8 / 3 / Romex SIMpull Stranded Indoor CU NM-B W/G Individual pack ( By-the-roll )

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Need to run approx 100 feet underground to my deck to power a sauna... 110 20 amp ... what size and kind of wire


Hi, happy to help! For a 110V / 20‑amp sauna circuit run 100 ft underground, you’ll want to use 12/2 UF‑B copper (direct‑bury rated) or THHN in PVC conduit, not NM‑B (Romex), which is indoor‑only and cannot be used underground. If we can help in any other way, please reach out to us at consumersupport@southwire.com.

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8-3 NM-B cable cannot be used. NM-B cable is not allowed to be used either outdoors or underground. I'd use #12 THHN/THWN-2 conductors in PVC conduit.

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